The temperature-dependent refractive index of zinc telluride film can be used to develop a tiny, low cost and film-coated optical fiber temperature sensor. Pulse reference-based compensation technique is used to largely reduce the background noise which makes it possible to detect the minor reflectivity change of the film in different temperatures. The temperature sensitivity is 0.0034dB/℃ and the background noise is measured to be 0.0005dB, so the resolution can achieve 0.2℃.
We proposed a refractive index sensor based on optical fiber end face using pulse reference-based compensation technique. With good compensation effect of this compensation technique, the power fluctuation of light source, the change of optic components transmission loss and coupler splitting ratio can be compensated, which largely reduces the background noise. The refractive index resolutions can achieve 3.8 × 10-6 RIU and1.6 × 10-6 RIU in different refractive index regions.
The rudimental microparticle contaminants and airborne molecular contaminants (AMCs) will obviously reduce the lifetime of the lens widely used in the high peak power laser system. An inline contaminants sensor based on the optical microfiber (OM) is here proposed. Due to Van Der Waals force and electrostatic attraction, contaminants are easily adhered to the surface of OM, which will cause an obvious perturbation to the evanescent field transmitted in the OM. The additional loss, caused by the adhered contaminants, has been theoretically analyzed and simulated. The corresponding experiments have also been carried out, and the experimental results agree well with the simulation. The inline containments sensor based on OM has potentially wide sensing range for many kinds of determinate absorptive materials.
An in-line fluidic absorption coefficient sensor based on the optical microfiber (OM) is proposed. We calculate the
insertion loss of the OM per millimeter after immerged into liquid with various absorption coefficients. Then a 1.8μm
diameter OM with 10 millimeters uniform waist region is used to analyze the absorption of pure water, and the
absorption spectrum from 1525nm-1565nm is achieved from the experiment, agreeing well with the reported absorption
coefficient. The in-line fluidic absorption coefficient sensor has potentially wide sensing range by controlling the
construction of OM for many kinds of absorptive liquids with lower refractive index than silica.
Optical microfibers have attracted much attention in recent years due to its physical flexibility and low bending loss,
which enables the possibility to make compact active optical components when combined with small-size piezoelectric
ceramic transducers. Here, we present the demonstration of OM embedded in low refractive index polymer wound
around a piezoceramic rod of 1 mm diameter and 6 mm length as a compact optical phase modulator, which showed a
frequency response up to 1 MHz. We also report the fabrication of a compact tunable optical resonator from a 3 mm
diameter, 1 mm thick piezoceramic disc with a 50 pm shift when 600 V is applied across its electrodes.
We demonstrate a technique for tapering periodically an all-solid soft glass fiber consisting of two types of lead
silicate glasses by the use of a CO2 laser and investigate the bend sensing applications of the periodically-tapered
soft glass fiber. Such a soft glass fiber with periodic microtapers could be used to develop a promising bend sensor
with a sensitivity of -27.75 μW/m-1 by means of measuring the bend-induced change of light intensity. The proposed
bend sensor exhibits a very low measurement error of down to ± 1%.
This paper reviews sensing applications of optical fibre microwires and nanowires. In addition to the usual benefits of
sensors based on optical fibres, these sensors are extremely compact and have fast response speeds. In this review
sensors will be grouped in three categories according to their morphology: linear sensors, resonant sensors and tip
sensors. While linear and resonant sensors mainly exploit the fraction of power propagating outside the microwire
physical boundary, tip sensors take advantage of the extreme light confinement to sense chemicals within minute areas.
We propose and experimentally demonstrate a novel fiber optic acoustic/rotation sensor array based on the Sangac
interferometer. The feasibility of sensing acoustic signal and rotation with a simpler signal processing in an array is